Cantherm EC20 Manual - Página 7

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Motor runs,
spart
CaIses:
1. Spray
nozle
2.
Fuel pump is
3.
Air
entering the
4.
Solenoid valve
is
5, Conbol
boad
is
6. Fuelfilter
is
dirty.
7.
Safety thermostat
8.
Air
proving switch
Solutions:
'1.
Spray nozzle
as
this may enlarge
2. Fuel
pump is
fuelpump.
Use
a
to
set
the
pump
nection and place
a
and
he
fuel
pump
necessary
The fuel
3.
Air
entedng
he
make
sure
all
inlet line
untilfte
air
raher
than
he
fuel
4.
Solenoid
valrre
is
voltage
to
he
noid valve is
proper
voltage
is
5.
Contol
board is
vafue
wires
connect
6,
Fuel
filter
dirty.
located where the
7.
Safety
bol board
and the
Use a multi-meter
infinity
(no
8.
Ak
proving
board
and the
powerto
$e
switch
to
the
conhol board
is
prlsent,
but there
is
no fuel spray
/or broken pump coupling
$
mp
thru the inlet line.
;tive.
ive.
ctive or tdpped or improper
duc'ting.
ctive.
Rernove
and inspect the spray
nozle.
Clean or replace
as needed. Do not clean the
nozzle orifice with
anything
metal
rifice.
,
The
ouput
pressure
of
$e
fuel pump
can be checked by
placing
a
high pressure fuel gauge
into
the
gauge port of
the
Mth
enough capacity to measure
he
high pressure
your particular
heater
can produce.
Use
the
adjushnent on
the
pump
to
lhe
manufacturer's specification.
lf
pu
do
not
have
a
fuel gauge, you may slightly loosen the
pump's
ouput
line
con-
t
rere.
Run
the heater
brieffy
and see
if
fuel
reaches
he
rag. lf
no
fuel is pumped, check the connection
between
the motor
re
sure
the
motor can fum
tre
pump. Also check
the extemal and intemal fuel
fittes fol
blockage,
and
dean or replace
if
rc
intemal filter is usually
located
vfierc
$e
fuel inlet
line enters
the
pump. Check to
make
sure motor
is rotating pump.
l
ump
trru
the fuel inlet line.
lf
air
enters
tre
pump
it
will
lose
its prime and will not maintain
adequate pump
pressure. First
inc uding
he
tuel filter
on
tre
inlet line
are
tighL lf
you
still
suspect
air is entering
fie
pump, start
eliminating
prtions
of
fie
is
found. Start this ptocess
at
tre
fuel
tank end of
the inlet line.
lt
may be necessary to
draw
fuel
from a small
container
;tive.
Use a multi-meter
set
to
measure
rrolts.
Check
for approximately
120
volts
at
$e
ends
of
the two wires
$at
carry
virlve;
lf
proper
voltage is read, try deaning the
valve if it is dirty. lf
the
vafue
will not
open
fully to
allow fuel spray, the
sole
lf
proper
voltage is not read, check
for voltage on the
contol
board
terminals that the solenoid
vafue wires connect
to.
lf
tre
solenoid
vafue
wires are
defectirre. lf
voltage
'rs
not
read on
the board terminals, the control board
is defective.
ive, Use
a
multi-meter
set
to
measure
voltage,
Check
for
proper
voltage on the two
board
terminals
that
he
solenoid
liproper
voltage is read, the
contol
board
is
ok. lf
proper
voltage is not read, the control board
is defeclive.
the extemal and intemai
fuelfilten
and
clean
or replace
as necessary.
Most
fuel pumps contain
an
intemalfuelfilter
lirre
enters the fuel pump.
rtive
or
tipped,
Also called overheat switch.
Some
indirect
oil heaters have
a
safety thermostat wired
betvtreen
the con-
id
valve. lf the heater bemmes too
hot
tris
normally closed
switch will open and
intemlpt
power to
the solenoid
valve.
to
neasure
ohms.
Place the multi-meter
probes on the
trlo
male
terminals of the safety thermostat.
lf
the
multi-meter
shows
the
safeg
thermostat is defective. lf
he
switch
opens up
before the
heater becomes
hot
the
safety thermostat is defective.
d
efectjve, Try
to start
tre
heater without duciing.
Indirect
oil
heaten
have an air proving
switch
wired
between
fte
confol
v
alve.
The air proving switch is
normally
open
and
requires
air
from the tuming fan blade to
close
the
switch and send
Va
ve, Set
a
mult-meter to measure
voltage, With ttre
fan
blade
tuming, check for voltage coming out
of the
air
proving
ya
ve. lf
no
voltage is read, next check
{or
volbge
at
the conbol board terminals out to the
air
proving
switch. lf voltage
at the
lhe
air
proving swttch is defective.
lf
no voltage is read at
the
board,
the control board
is
defective.